sys/dev/drm/include/linux/kobject.h

   1 /*
   2  * Copyright (c) 2016-2018 François Tigeot <ftigeot@wolfpond.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_KOBJECT_H_
  28 #define _LINUX_KOBJECT_H_
  29
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/sysfs.h>
  33 #include <linux/compiler.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/kref.h>
  36 #include <linux/kernel.h>
  37 #include <linux/wait.h>
  38 #include <linux/atomic.h>
  39
  40 enum kobject_action {
  41         KOBJ_ADD,
  42         KOBJ_REMOVE,
  43         KOBJ_CHANGE,
  44         KOBJ_MOVE,
  45         KOBJ_ONLINE,
  46         KOBJ_OFFLINE,
  47         KOBJ_MAX
  48 };
  49
  50 struct kobject {
  51         const char *name;
  52         struct kref kref;
  53         struct kobj_type *ktype;
  54 };
  55
  56 struct kobj_type {
  57         void (*release)(struct kobject *kobj);
  58         const struct sysfs_ops *sysfs_ops;
  59         struct attribute **default_attrs;
  60 };
  61
  62 static inline int
  63 kobject_uevent_env(struct kobject *kobj, enum kobject_action action, char *envp[])
  64 {
  65         return 0;
  66 }
  67
  68 extern __printf(4, 5) __must_check
  69 int kobject_init_and_add(struct kobject *kobj,
  70                          struct kobj_type *ktype, struct kobject *parent,
  71                          const char *fmt, ...);
  72
  73 extern void kobject_release(struct kref *kref);
  74
  75 static inline void
  76 kobject_put(struct kobject *kobj)
  77 {
  78         if (kobj != NULL)
  79                 kref_put(&kobj->kref, kobject_release);
  80 }
  81
  82 static inline void
  83 kobject_del(struct kobject *kobj)
  84 {
  85         /*
  86            This function is supposed to unlink the object from a hierarchy.
  87            There is no such hierarchy in the DragonFly implementation, doing
  88            nothing is fine.
  89         */
  90 }
  91
  92 #endif  /* _LINUX_KOBJECT_H_ */